Plug and receptacle.



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N MARSHALL PLUG AND RECEPTACLE.

(Application lod Nov. 7, 1900.)

(No lodel.)

MUM/55555.

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UNITED STATES PATENT OFFICE.

NORMAN MARSHALL, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO MAR- SHALL-SANDERS COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORA- TION OF MAINE.

PLUG AND RECEPTACLE.

SPECIFICATION forming part of Letters Patent No. 714,928, dated December 2, 1902- Application filed November 7,1900. Serial No. 35,775. (No model-l To @Zt whom t may concern: y

Be it known that I, NORMAN MARSHALL, a citizen of the United States, residing at Newto-n, in the county of Middlesex, State of Massachusetts, have invented a new and u'seful Electric Coupling or Plug and Receptacle, of which the following is a specification.

My invention relates to improvements in couplings for electric circuits designed to 1o make temporary connections or taps to permanent circuits,cornmonlyknown as plugs and receptacles;7 and the object of my invention is to provide a strong, compact, easilywired, and cheap coupling.

I attain these objects by the mechanism illustrated in the accompanying drawings, in Which- Figure l is a sectional view of my fusible coupling with the plug inserted and circuit 2o closed. Fig. 2 is a plan View of the inside portion of the cap or plug, showing the leading-in wires, contact-plugs, and fuses. Fig.

3 is a sectional view of the coupling without fuses. Fig. Il is a view of 'the inside of the cap, showing the clips which hold the leading-in wires of the temporary tap, plugs, and holes for leading-in cable. Fig. 5 is a plan of the receptacle with the lid up and cap removed.

Similar letters referto similar parts throughout the several figures.

The cap A, Figs. l and 2, preferably made of porcelain, has a recess F, upon the bottom of which are borne .the coupling-pins H I-I', with which are connected the fuse-wire screws O O', and from these screws lead the fuses L L' to the wire-binding clips R R', to which the cable or wires Gr are attached.

B, Figs. l and 3, is a body, of insulating 4o material, preferably porcelain, with shouldered recesses for the coupling-sleeves S S' and slots upon the sides for the wire-binding screws T T'. The metal coupling-sleeves S S' are drilled out at their upper ends and split,

so as to clamp the plugs H H', carried bythe cap. The lower ends are drilled to receive the wires K K' and tapped laterally for the binding-screws T T'. These sleeves are shouldered, as shown, near the lower end to lit a 5o corresponding shoulder on the porcelain and the reduced portion threaded at I I', so that when the nuts J J' are screwed on the sleeves are held securely to the porcelain body. This insulating-piece can be molded in porcelain with a simple die, while all the metal parts may be rapidly made with automatic machinery. The face-plate C is either cast or made from sheet metal, a recess being blanked and milled out for thelidD, which when down makes a finished surface and incloses all cur- 6o rent-carrying parts when the temporary connection is Withdrawn.

Fig. 3 is a sectional view of a sinallersize of my improved coupling adapted for restricted spaces and tobe used without fuses. The construction of the receptacle B is exactly similar to that shown in Fig. l. The faceplate is also similar, except in its outer contour, which is round.

The cap a, Figs. 3 and 4, is recessed at F 7o and provided with holes V V' for the linewires or cable and with shouldered holes for the screw-plugs h 71,', which are threaded for avportion of their length and screw into the contact-plates r fr', clamping the cable ends 75 between said plates and the bottom of the cap-recess.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In an electric coupling for making tem- 8o poi-ary connections to an electric circuit, as a new article of manufacture, the insulatingbody B with shouldered recesses adapted to receive the metal sleeves S S' with the fastening-nuts J J' and wire-binding screws T T' in 85 combination with a face-plate and cap adapted to form the terminal of the temporary circuit.

2. In an electric coupling, an insulatingbody provided with shouldered recesses,metal '9o sleeves mounted therein and having shoulders for engaging the shoulders of the recesses, nuts threaded on said sleeves for holding said shoulders in engagement, recesses in the ends of said sleeves for the wires, and binding-screws threaded in said sleeves, substantially as described.

3. An insulating-body for an electric coupling provided with shouldered recesses adapted to receive metallic sleeves, and with slots roo upon the sides opening into said recesses and l atF and provided with shouldered holes opentc' adapted for binding-screws in the metallic ing into said recesses, screw-threaded plugs sleeves, substantially as described. 7L, h, in said holes, plates in said recesses F 4. In an electric coupling a cap a of insuthreaded on said plugs and serving to clamp lating material recessed at F and provided the line-wires, substantially as described.

with holes V, V for the line-Wires and with NORMAN MARSHALL.r shouldered holes for the plugs, substantially Witnesses: as described. E. M. BAKER,

5. In an electric coupling, a cap a recessed L. G. MILTON. 

